13 Battery Management
SMA America, LLC
106
SI4548_6048-US-TB_en-13
Technical description
13 Battery Management
The battery management of the Sunny Island supports the following three battery types
("221.01 BatTyp" parameter):
The battery capacity ("221.02 BatCpyNom" parameter) is to be entered as the nominal capacity for
a 20 hour discharge (C20). If this information is not available from the battery manufacturer's
datasheet, it can be calculated from the data for different discharge times (120 h, 100 h, 20 h, 5 h,
1 h) in the following manner:
100 Ah (C20) per 1 kW of the PV plant output power should be present as a minimum battery
capacity.
The Sunny Island is designed and preset for a nominal battery voltage (parameter "221.03
BatVtgNom") of 48 V (24 cells for every 2 V) with lead-acid batteries (FLA and VRLA) and 45.6 V
(38 cells for every 1.2 V) with nickel cadmium batteries.
FLA
F
looded
L
ead
A
cid: Closed lead-acid batteries with liquid electrolyte in all
standard designs available on the market (grid plate, tubular plate, small,
large, etc.).
VRLA
V
alve
R
egulated
L
ead
A
cid: Closed lead-acid batteries with immobilized
electrolyte in gel or AGM (Absorbent Glass Mat Separator) in all standard
designs available on the market (grid plate, tubular plate, small, large,
AGM, Gel, etc.)
NiCd
N
ickel
C
admium: Sealed pocket-type plate or fiber plate nickel-cadmium
batteries.
C20
C120/1.18
C20
C10/0.92
C20
C100/1.15
C20
C5/0.81
C20
C20
C20
C1/0.57
Failure of individual battery cells
If individual battery cells fail over several years of continuous operation, the nominal voltage
can be set in the range from 42 V to 48 V. Up to three individual cells can be removed and the
plant can still continue to operate.
Summary of Contents for Sunny Island 4548-US
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